the prep packages seems to be slightly different from year ranges.. most important to check before you start is to make sure the wiring is hanging for the compressor, pressure switch, etc. if you have those, check the firewall to see if the evaporator and expansion valve are already installed. if you have that check if the condenser is there (i dont think it is on your model).

I have all three a/c lines and pressure switch if you decide to embark on this endeavor. I'll sell them to you.